Revealing mistake: In one of the final scenes where Stallone is hanging out of the Statue of Liberty, you can see that his "JUSTICE TATTOO" on his upper arm is a fake. You can see at the edge of the tattoo that it is glued on the skin.

Continuity mistake: When Dredd is talking to Hershey in her wrecked apartment the cut above his eye runs across his eyelid but later on when he's talking with Rico in the Janus lab the cut follows his eyebrow and doesn't touch his eyelid.

Continuity mistake: In the scene where one of the "high council" is speaking (behind a desk or pedastal), there is a close-up shot of the highest ranking council member's face. In his nostril you can see a dry booger. They then change the shot and then come back to a close-up of his face. The booger is no longer there. Sorry if this is a bit gross, but I found it amusing.

Trivia: After the fake Dredd kills the judge and his wife in their apartment, the camera then cuts to a street scene in which Hershey is calling in their location as "at the corner of Burns and Allen." This is a cinematic tip-of-the-hat to the legendary comedy team of George Burns and his wife Gracie Allen. She also says they are "at the corner of Abbot and Costello" in the beginning.

Chosen answer:The facility only ever cloned Rico and Dredd. It had never been tested at max capacity. The equipment was also 30 years old and Rico tried to birth the clones early which the system wasn't designed for. The stress of all these things added up to destroy it.